Fix applying global color filter (close #1088)

app/src/main/kotlin/org/koitharu/kotatsu/core/db/dao/PreferencesDao.kt

@@ -1,6 +1,8 @@
 package org.koitharu.kotatsu.core.db.dao
 
-import androidx.room.*
+import androidx.room.Dao
+import androidx.room.Query
+import androidx.room.Upsert
 import kotlinx.coroutines.flow.Flow
 import org.koitharu.kotatsu.core.db.entity.MangaPrefsEntity
 
@@ -13,6 +15,9 @@ abstract class PreferencesDao {
 	@Query("SELECT * FROM preferences WHERE manga_id = :mangaId")
 	abstract fun observe(mangaId: Long): Flow<MangaPrefsEntity?>
 
+	@Query("UPDATE preferences SET cf_brightness = 0, cf_contrast = 0, cf_invert = 0, cf_grayscale = 0")
+	abstract suspend fun resetColorFilters()
+
 	@Upsert
 	abstract suspend fun upsert(pref: MangaPrefsEntity)
 }

app/src/main/kotlin/org/koitharu/kotatsu/core/parser/MangaDataRepository.kt

@@ -52,6 +52,10 @@ class MangaDataRepository @Inject constructor(
 		}
 	}
 
+	suspend fun resetColorFilters() {
+		db.getPreferencesDao().resetColorFilters()
+	}
+
 	suspend fun getReaderMode(mangaId: Long): ReaderMode? {
 		return db.getPreferencesDao().find(mangaId)?.let { ReaderMode.valueOf(it.mode) }
 	}

app/src/main/kotlin/org/koitharu/kotatsu/reader/ui/colorfilter/ColorFilterConfigViewModel.kt

@@ -73,9 +73,7 @@ class ColorFilterConfigViewModel @Inject constructor(
 	fun saveGlobally() {
 		launchLoadingJob(Dispatchers.Default) {
 			settings.readerColorFilter = colorFilter.value
-			if (mangaDataRepository.getColorFilter(manga.id) != null) {
-				mangaDataRepository.saveColorFilter(manga, colorFilter.value)
-			}
+			mangaDataRepository.resetColorFilters()
 			onDismiss.call(Unit)
 		}
 	}